A diff tool application, in contrast, is dedicated to just this single job: helping you understand diffs more easily. It uses colors, special formatting, and even different arrangements (side-by-side, combined in a single column, etc.) to achieve this:

Some of these tools can even help you solve merge conflicts. Especially in this situation, you'll quickly come to appreciate a tool that helps reduce complexity and avoid mistakes.

Today, there are lots of great tools on the market. Below is a short list to give you an overview.